Oh my gosh.
I'm at work, on my lunchbreak, but wanted to drop in for few minutes. Thanks a bunch for the suggestions! (LOVE this forum!) And, Guttersquid, is it? Nifty rewritten suggestion. Funny. I actually scribbled a few different versions of those lines, and yours was one of my earlier versions of it. But when I get to revising so much, my eyes go crazy and nothing looks right. Then I just leave it as is and move on.
Maxim, is just Maxim. No nicknames anywhere in the story. And, contrary to the origins that one may expect (i.e. Russian, etc) he's supposed to be from Boston and grew up in the Bronx, lol. So the "Eh" and the over-excited exclaimation mark, is mostly just a result of how his personality/character is. Well, how I envision him in my head, anyway.